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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of analysis of other comprehensive income by item [abstract] |
Disclosure of changes in accumulated other comprehensive income (loss) | The components of, and changes in, accumulated other comprehensive income (loss) are as follows:
| 2020 | 2019
Currency translation adjustment |  |
Opening balance, Jan. 1 | (21) |  | 17 |
Gains (losses) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax | (11) |  | (59) |
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax | 11 |  | 21 |
Balance, Dec. 31 | (21) |  | (21) |
Cash flow hedges |  |
Opening balance, Jan. 1 | 527 |  | 508 |
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax(1) | (91) |  | 19 |
Balance, Dec. 31 | 436 |  | 527 |
Employee future benefits |  |
Opening balance, Jan. 1 | (55) |  | (29) |
Net actuarial gains (losses) on defined benefit plans, net of tax(2) | (11) |  | (26) |
Balance, Dec. 31 | (66) |  | (55) |
Other |  |
Opening balance, Jan. 1 | 3 |  | (15) |
Change in ownership of TransAlta Renewables | — |  | 1 |
Intercompany investments at FVOCI | (50) |  | 17 |
Balance, Dec. 31 | (47) |  | 3 |
Accumulated other comprehensive income | 302 |  | 454 |
(1) Net of income tax of $23 million for the year ended Dec. 31, 2020 (2019 — $6 million). (2) Net of income tax of $3 million for the year ended Dec. 31, 2020 (2019 — $7 million).

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